React\HttpClient\Request::getResponseFactory PHP Method

    public function getResponseFactory()
    {
        if (null === ($factory = $this->responseFactory)) {
            $stream = $this->stream;
            $factory = function ($protocol, $version, $code, $reasonPhrase, $headers) use($stream) {
                return new Response($stream, $protocol, $version, $code, $reasonPhrase, $headers);
            };
            $this->responseFactory = $factory;
        }
        return $factory;
    }